Molding machine



Allg 30, 1932 .1. A. DE TUR'K 1,87%698 xmLDING MACHINE Filed Nov. 14; 1924 7 Sheetsfsneaz, 1

-75 V7 @l a mums J. A. DE. TURK Momma ummm Filed Nav. 14, 1924 Aug. 30 1932.

7 Sheets-Sheet 2 Aug. 30, 1932.

J. A. DE TURK HOLDING MACHINE.-

Filed Nov. 14', 1924 '7 Sheets-Sheet 3 llg. 30, 1932. J, A, DE TURK 1,874,698

- `Momma MACHINE Filed Nov. 14, 1924 7 Sheets-Sheet 4 J. A. DE Tur-K HOLDING MACHINE Aug. Y30, 19132.`

Filed Nov. 14, 1924 7 Sheets-Sheet 5 Aug.3o,1932. J. A. DE TURK 1,874,698

MOLDING MACHINE Filed Nov. 14, 1924 '7 Sheets-Sheet 6 All@ 310, 1932 v J. A. DE TURK y MQLDING MACHiNE l K Filed Nov. 14, 1924 7 sheets-Sheet 7` Patented `Aug. 30, 1932 UNITED l s'rrrasv l`PAI`FNT OFFICE JEREMIIALH AMOS DE TURK, 0F LA GRANGEILLINOIS, ASSIGNOR TO WESTERN ELEC- TRIC COMPANY, INCOILPOIELA'IED,` OF NEW` YORK, N.` Y'., A CORPORATION OF YORK MOLDING MACHINE Appiication mea November 14, 1924. serial No. 749,825-- This invention relatesv to moldingV machines, and more particularly to machines for molding articles from plastic material.

The vprimary object of the invention is to provide an improved molding machine which will produce a relatively large number of molded articles in a 'given period of time with a minimum amount of attention and supervision. y

One form of the invention is embodied in a molding machine having three separable multi-member molds slidably mounted in a support rotatable by hydraulic means to successively advance eachl mold into threeV poe sitions. A mold in the' first position is charged with moldable material and closed. The machine is then set in motion under the control of a cyclic .timing means and when Y the filled Amold advances into the second position it is heat-ed and after being subjected to a predetermined pressure for a predetermined length of time, is subjected to a dif` *ferent pressure for a predetermined length of time. The mold thenladvances to a third position, wherein it is cooled and subjected y to a predetermined pressure for a predetermined length of time, whereupon it is returned to the first position. In this position the mold is opened, the molded product is loosened and removed from the cavity, one

of the mold members engagingV an element to preheat it for the next molding cycle. Each positionis provided withrindividual hydraulic means serving to apply ,the pressures in the second and third positions, separate the members and loosen the product 1n the first position. Other objects and features of the invention will become apparent as the detailed description progresses, reference being had to the accompanying drawings, wherein Fig. 1 is a front View, partly in section, of a machine embodying the invention;

Fig. 2 is a side view of the improved molding machine; l

. `forms a appear (Fig. 41).,

l 3 is a plan fview of the improved mold` ing machine; p Fig. 4 is a sectional view taken on line of Fig. 2; u Y

f Fig. 5 is a sectionalview taken on line 5,-7-5 cf Fig. a; y Y l Fig. 6 is a sectional view taken 0n `line 6-6 of Fig. 3; I -Y Fig. 9'is a sectional view taken on lineV 9,-'9

of Fig.4;

Fig. 10 is a plan view of mechanism which times the operations of the improved moldinmachine; p "l ig. 11 is a sectionalview taken on line 11-11. QfjFig. 110; y y l 'Fig'. 12 is a sectional view taken'ongline iva-12 Ofiig. 11; j 1

Fig.,13"is a sectional view taken Online 13e-,1 3 of Fig. 10; Fig. 14 is a` sectional view takenV onv line V16k-let of Fig. 10, 'and` Fig. 15 is a diagram Vof a circuit which part of the improved Vmolding machine.

281b'y Aafiange 34 formed integral with thev molding `member and eiachmolding member In the' drawings, 20a is a base and 21 lis a.

31 Vis provided with bores 36 and 37 and recesses .38 for a purpose whichwill presently Mounted uponthe base 2O arethree hydraulic cylinders 40, 41, and 42 having lrams 43, 44, and 45, respectively. The hydraulic cylinders 40, 41, and 42 are equi-distantly spaced from each other and from the post 24 so that the molds 30 which are also equi-distantly spaced from each other and from the post 24 may be aligned with the cylinders.

Depending thereto is a sleeve 48 having three notches 49 engageable by 'a pawl 50` which isvpivoted upon a gearv 51 rotatably journaled upon the under pressure is supplied through pipes 60- sleeve. A compression spring 53 urges the pawl'50intothenotches 49. Meshing with the.' gear4 51 is "afi-ack 55 kwhich isislidably journaled in a bracket 56 and is secured tothe forward end of a plunger 58 disposed" in a hydraulic cylinder 59 to whichliquid and 61 toreciprocate the plunger 58 and the rack 55, the pipe 60 beingconnected directlyto a sourcefnotwshown)V of liquid under pressure. i The rack'55, when reciprocated, oscillates the gear 51 so that the pawl 50 will engage the notches 49 and advance the plate'28 onehundred and twenty degrees in a clockwise direction (Fig.4)'. 'Y

Projecting from the rackl 55 is a lug 63 y. e. adapted to engage a shoe 64 when the rack is advanced. The shoe 64 is slidablymounted on the lower end of a rod 65and is also slid? ably mounted in a bracket 66 secured to the Y' base 2 0. Y. Interposed between the rod 65 and the shoe 64 is a compression spring 67 which urges the `shoe toward the rack 55. The upperY end of the rod 65 is slidably journaled in a bracket `68Ysecured to one of the rods 23. A coinpressionspring 7 Ointerposed between the bracket 68 and a collar 72 ,secured to the ,rod urgesthe rod toward the rack 55. YThe construction is suchk that when the rack 55 ism advanced the lug 63 will engage the .shoe

64 :and compress the springs 67 and70 to bring the upper end of the rod`65 into en-k gagement with the under surface of the plate 28., When the plate 28v has been'rotated sulfi- 'ci'ently tovbring one `of three notches 75 in the plate in alignmentwith the rod 65, the ,rod

will enter the notch and lock the plate against ,Y further rotation.

Aligned with the hydraulic cylinder 40 and mounted upon the frame member 21 is a bracket 77 carryng an electric motorl 78 adapted to drive a shaft79 whichV is journaled inthe bracket 77 and has rigidly secured to it a worm 80 meshing with a worm gear 81 threaded upon avertically disposed v.screw 82', the screw 82 being slidably jourinaled in a block 83mounted upon the bracket f77. `Rigidly secured to the lower end of the screw 82 and engaging ways 84 formed upon vthe bracket 7 7 is ay slide 85 journaling a shaft 'Q86 whichhas rigidly secured to it altilting frame 87 (Figs. 4 and 9). Journaled in the tilting frame '87 are shafts 88 carrying dogs from the plate 28 and secured' 89 which are urged by springs 90 into positions wherein they may engage recesses 91 in the molding members 32. Secured to the outer end of each shaft 88 'is a lever 93 which levers are connected by links 94 to a lever 95 at 96.` The lever 95 may be manipulated by lthe operator towithdraw the dogs 89 from the recesses 91 against the action of the springs 90. .V

Secured to the'ends of the shaftq86 are levers 97 having anti-friction rollers 98 disposed in cam slots 99 of a pair of brackets 100 'mounted upon the frame member 21. The vcam slots99 are so designed thatif the pivotally mounted upon the tilting frame as '.70

slide 85 is moved upwardly the levers 97 and the shaft 86 will bring the tiltingframe 87 e into vthe position wherein it is shown in Fig. 7 and wherein it is disposed in close proximity to a heating plate 102 secured to a bracket'103 mounted `upon the frame member 21, the heating plate 102 being provided with passages .104 through Awhich al heated -iiuid may be passed by way of pipes 105 con nected to any suitable supply (not shown) of heated fluid. `The function of 'the/heating plate 102 is to preheat the molding members 32. Thus, when a mold is brought into Vthe position wherein it isv aligned with the slide 85, the motor'78 will be actuated by' means hereinafter described totlower Ythe screw'82 and the slide 85 through the medium of the 89 engage the recesses 91. The motor is then reversed and the slide 85 isinoved upwardly and carries the molding member 32 with it, the tilting member 87 being adapted to rest the. molding member 32 upon the heating plate 102. A previously molded' article may then'be removedv from the. mol-d and a sup- "mff ply of moldable material may be placed into the molding member 31 for the following molding operation. Y

yPins106 and 107 carriedY by the/rain 43 are adapted to enter the bores 36 and'37, respectively. When a mold 30 has been brought into alignment with. the hydrauliccylinder 40, liquid under pressure is admittedfto the 43, the spring 110 beinginterposed between 'the`lug`112 and a washer 113 secured tothe.:

rod 111. u

worm 80 andy the wormY gear v81 untilthe dogsV iio hydraulic cylinder 40 through a lpipe 108 upon the associated bracket 118.

,115 are adapted to bc brought into positions i wherein jaws 116 forn'iedv upon the levers will engage the recesses 38`(,Fig. 1). Each lever is pivotally mounted intermediate its ends upon a pin 117 secured in one of a ,gt pair of brackets 118 which are mounted uponV Vslot 119 in each,

the base 20. Engaging a lever is a pin 120 carried in the forward end of a plunger 121 slidably journaled in a hydraulic cylinder 122 which is mounted under pressure may be admitted to the cyl-V inde/rs 122 through pipes 124 to so displace theplungers 121 that the levers 115 willA be brought into positions wherein their jaws M 116 engage the recesses 38, the levers being 20' subsequently withdrawn from these positions by compression springs 125 disposed in recesses 126 formed in the brackets 118.

A heating plate 130 secured to the underside of the frame member 21 is aligned with a heating plate 131 carried by the ram 44, the heating plates 130` and 131 being of the same type as the heating plate 102 and being supplied with heated liquid from anyv suitable source (not shown) through pipes 132 and 133, respectively, which are connected to theheating plates 130 and 131 byA sections 134 and 135, respectively, of flexible tubing.` WThen Va mold 30is positioned between the heating plates 130 and 131, fluid under pressure may be admitted to the hy* draulic cylinder 41 through a pipe 137 to cause the ram 44 to hold the moldingrmembers 31 Yand 32 of the mold in pressing en-` gagement with each other between the heating plates 130 and-131 so that the plastic compound on .the mold is simultaneously subjected to heat and pressure. A pipe 139 connectsthe hydraulic cylinder 41 directly with any suitable supply (not shown) of liquid under pressure so that the ram 44 will he retracted whenever relieved.

A chilling plate 140 secured tothe under? side of the frame member 21 is aligned with a chilling plat-e 141 carried by the ram, theJ pressure in' thepipe 137 is ychilling plates 140` and v141 being substanA tially of the same type of construction as the heating plate 102 and being supplied with liquid from any suitable source (not shown) through pipes 142 and 143 which are connected to the chilling plates 140 and 141 by sections 144 and i145, respectively, of flexible tubing (Fig. 6). Vhen al mold 30 is positioned between the chilling plates`140 and l141, fluid under `pressure may be admitted to the hydraulic cylinder 42 through a pipe 147 to cause the ram to hold the molding members 31 and 32 in pressing engagement with each other between the chilling plates 140 and 141 so that the plastic compoundin Liquid the mold vis simultaneously cooled f` and subjected to pressure. A pipe `149 connects the hydraulic cylinderywith .any suitable supply4 (not shown) of fiiuid "under pressure. sothat f n the ram` 45 willjbe retracted whenever press V surein'thepipef147 is relieved." y

The mechanism for timing'the :various operations of the above described apparatus mayV be located at any convenient point and comprises an electric motor 151 adapted to drive a shaft 152 through 'suitable reduction :gearing indicated at 153 (Fig. 10). The shaft 152 is journaled in a bearing 155-mounted upona base plate 156 and has rotatablysmounted upon it a ratchetV 157 engageable by a pawl 158 secured to a shaft- 1'59 whichis journaled in a bearing 16() mounted upon theY basevplate. 156. Also secured to the shaftf 159 isla dogl 162 adapted to engage a linger 163for`med integral with a disc. 164k keyed to shaft 166,r 5'

the axis of which iscoincident with the axis of the shaft` 152-. The. shaft 166 is journaled in bearings 167 mounted upon the-base plate 1,56." The collar 164 is connected to. the ratchet 1574 by a spring 169 which isdisposed around the shaft 152 and has itsends threaded.

frictionally engaging the `shaft 152 with sufli,

cient force'to drive theco1'lar1`64and the shaft rsf sevr

ido

166; rIt-the pawl`158 is brought into.` the position wherein it is shown in dotted I'lines in Fig; 11 the vdog 162 will bedisposedin` the nl path of the finger 163 and upon engagement therewith 'will be brought into the position wherein it is shown infullllines in Fig. 11,

thuseausing thepawl 158 to again 'engage the ratchet 157. The means for withdrawing the pawl'- 158 from engagementwith the ratchet 157 comprises a leverA 17 0 atliXed tothe shaft y159 and connected by a link 172 to a lever 173 pivotally mounted' upon a" bracket -1747secured to any suitable fixture 175.

V" Constrained to rotate with the shaft 166'are slip rings 177 and 178 'and commutatore. 179 and 180. n As diagrammatically illustrated in Fig; 15, the commutator179`comprisescommutator bars 181, 182', 183, and 184, and the commutator yv comprises commutator bars 186, 187, 188, and 189. The commutator bars 181, 187, 183, and 189 are electrically. cone nected by suitable conductors tothe slipring y y 178,'the commutator bars 186, 182,- 188, andi` 184 being electrically connected by suitable conductors to a slip ring 177 Brushes 191, 192, 193, and l194, respectivelyiengage the .slip

rings 177 and 178Aand the commutators 179 1 and-180. A'The fbrushes191 and 192 farecon'- .Qsleeve 48.' When the plate 28 has been adnected to anysuitable'source (not shown) of electrical energy and the brushes 193 and 194] :are connected to: the vmotor 7,8, the arrangement being such that the motor 78'will be op-l erated to lower and raise the'slide 85 two times for each revolution ofthe shaft'166.

Rigidlysecured to the shaft 166 are cams 201 to 205, inclusive, which Vcontrol valves indicated by the reference characters 207 to`211,

V19 Jvinclusive, one valve being associatedwith each cam. The valve 207 cam 201 alternately connectsa waste water when operated by the pipe line 214 and a hydraulic supply line 215 to the pipe 61. wThe valve 208 when operated 19T by the cam'202 alternately connects the waste water'line 214 and the hydraulic supply lme 22 line 214 andthe hydraulic supply 215 to the pipe 108 and the pipes 124. In a like manner, the valve 209 is adapted to alternately connect the pipe 137 to the waste water pipe 137 being also alternately connected to the waste Water linel 214 and the hydraulic i supply line 216 bythe valve 210. The valves 209- and 210 and their cooperating cams are so designed thatthe hydraulicsupply lines 215 and 216 cannotbe placed in communication with each other. The valve 211 alternately connects the pipe 147 with the waste water line 214 and the hydraulic supply line 216. The pressure in the hydraulic supply line 216 is preferably several times greater than the pressure in the hydraulic supply line 215.

i In thev operation of the machine the motor 151'is first connected to any suitable source (not shown) of electrical energy whereby it will be operatedcontinuously and the particular mold 3.0 which is aligned with the hydraulic cylinder is charged with suitable plasgtic compound. The lever .17 3 is manipulated'tov disengage the pawl 158 from the ratchet 157 so that the spring 169 will frictionally engage the shaft 152 and cause the shaft Y166 toV makeone revolution withthe shaft 155. -A-s the shaft 166 revolves, the brushes 193 and 194 contact the commutator bars 181 andr186, respectively, and the mo- Y tor 7 8 lowers'the slide 85 toy bring the molding vanced a distance suflicient to bringthe mold .into alignment with Vthe hydraulicV cylinder 41 the rod 65 cooperates with'one of the `notches 75 to lock the plate against 'further -rotation. 1-`The valve ,2,09 is then `operated line 215, the` to yconnect the hydraulic supply line 215 with the hydraulicfcylinder 41, and the ram 44 is,

forced upwardly to clamp the molding members 31 and 32 between the heating plates 130 and 131.l After the plastic'compound in the mold has been subjected to heat and pressure for a predetermined period of time, the valve 210 is operated to connect the hydraulic cylinder 41 with thehydraulic supply' line 216 so that the moldable compound is subjected Vto a higher pressure for another predetermined period of time, The

finger 163 then engages the kdog 162 and ro- Y tates the shaft 159 to bring the pawl' 158 into engagement with the ratchet 157 and the driv- Ving engagement between the shafts 152 Iand 166 is broken. During the time this mold is subjected to heat-and pressure the following mold in alignment with the'hydraulic cylinder is charged and closed in the-manner above described and the lever 173 is again employed to e'liect the driving engagement between-the shafts 152 and 166. VThe mold which has beeny subjected to heat and pressure is then advanced with the plate 28 to a position whereinit is aligned with thehydraulic cylinder 42, the plate 28 being indeXed to this position by the mechanism comprising the rod 65. The valve 211 then connects the hydraulic cylinder 42 with the hydraulic supply line 216, andthe ram 45 causes the mold to be clamped between the chilling plates 140 and 141 for a predetermined period of time, after which, the connections between the shafts 152 andy 156 are again broken. Then after the third mold has been charged the lever 17 3 is manipulated to set-the machine in cyclic operation and the chilled mold is returned to the position wherein it is aligned with the hydraulic cylinder 40. When the chilled mold is in the position in which it is aligned with vthe hydraulic cylinder 40, the cam 202 operates the valve 208 to connect the hydraulic cylinders 40 and .122 to the hydraulic supply line v215 so that the lower mold member 31 will be held in place by the jaws 116 while the pins 106 and 107 moving with the ramf'43 lift the upper mold mem- Y ber and loosen the molded article. The brushes 193 and 194A then contact with the commutator bars 183 and 188 and the motor 7 8 lowers the slide 85 until the dogs 89 engage the recesses 91. The brushes 193 and 194 then contact with the commutator bars 184 and 189 and the motor 78 is reversed to bring the molding member 32 into contact withV theV heating plate 102, the molding members 31 and 32 having been previously separated by the pins 106. and the molded product having been loosened from the mold by the pins 107 inthe manner described above. This series of operations lisidentical for each mold 30, it being necessary to manipulate the lever 17 3 three times to subject the mold and the plasoperations. Y

pound to soften and to distribute itself in the mold cavity. In the preferred embodiment of the invention the moldable compound is subjected to an initial pressure, approximating five hundred pounds per square inch of surface, and is then subjected to a pressure approximating two thousand pounds per square inch of surface, both pressures being applied during the heating operation. The lowerpressure may be applied during aV period of time ranging from one to three minutes, the

higher pressure being applied from three to ,ten minutes. During the cooling operation,

"the compound is preferably subjected to the highest pressure.

What is claimed is:

l. In a molding machine, a mold comprising a plurality of molding members, heating means, and means for displacing one of said molding membersrelative to the other and place it in contact with said heating means.

2. In a molding machine, a mold including a plurality of molding members, a rotating table designed to receive said molds, means for lowering one of said molding members to said table, means for displacing the free molding member comprising a gripping mechanism engaging said molding member, means for imparting anni-directional movement to said mechanism, and vmeans for actuating said last recited means in timed relation to the rotation of said table. v

3. In a machine for molding articles from synthetic resins and the like, a plurality of sectional molds, a plurality of process stations in sequence, means to transfer a mold cyclically from station to station, operating means to open, unload and close a mold at one station, a heating means, means for placing one sectionof the opened mold in contact with the heating means,operating means to heat a mold and subject its contents to pressure at a second station, operating means to chill a mold and subject its contents to pressure.

4:. In a molding machine, a mold comprising a plurality of sections, heating means, and means for displacing one of the mold sections relative to the other and for placing it in contact With the heating means, said mold section displacing means comprising a member movable in a guideway, means formoving the member, a member having an arcuate slot, a mold section engaglngmember pivotally supported bythe movable member, and a guide member carried by the mold section engaging member and disposedwithl in the arcuate slot.

' In Witness whereof, I hereunto subscribe my name this`28th day of October A. D., 1924.

JEREMIAI-I AMOS DE TURK.

j aov 

